EP2574638A1 - Organopolysiloxane (méth)acrylique modifié, composition de silicone durcissable par rayonnement, doublure de libération de silicone et procédés de fabrication - Google Patents

Organopolysiloxane (méth)acrylique modifié, composition de silicone durcissable par rayonnement, doublure de libération de silicone et procédés de fabrication Download PDF

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Publication number
EP2574638A1
EP2574638A1 EP12183505A EP12183505A EP2574638A1 EP 2574638 A1 EP2574638 A1 EP 2574638A1 EP 12183505 A EP12183505 A EP 12183505A EP 12183505 A EP12183505 A EP 12183505A EP 2574638 A1 EP2574638 A1 EP 2574638A1
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Prior art keywords
acrylic
meth
modified organopolysiloxane
epoxy
radiation
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German (de)
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EP2574638B1 (fr
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Osamu Tsuchida
Shinji Irifune
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Shin Etsu Chemical Co Ltd
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Shin Etsu Chemical Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/38—Polysiloxanes modified by chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/401—Adhesives in the form of films or foils characterised by release liners characterised by the release coating composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2483/00—Presence of polysiloxane
    • C09J2483/005—Presence of polysiloxane in the release coating

Definitions

  • This invention relates to a (meth)acrylic-modified organopolysiloxane, a radiation-curable silicone composition comprising the organopolysiloxane, a silicone release liner comprising the composition, and methods for preparing the same.
  • silicone compositions find use in numerous fields of industry as release liners. They are used and consumed in a large volume all over the world. Their most common application is protection over pressure-sensitive adhesive layers. Recently, such silicone coatings find an increasing application using a polyethylene terephthalate (PET) film as the substrate, intended for use in electronic parts, optical components or the like.
  • PET polyethylene terephthalate
  • the cure mode of silicone compositions is generally divided into two types: heat cure and radiation cure.
  • heat-curable compositions account for the majority.
  • radiation-curable compositions are suitable.
  • One advantage of the radiation-curable compositions is the elimination of metal catalysts.
  • tin complexes are often used as the condensation type catalyst.
  • the current concerns about the environment recommend to refrain from using tin complexes.
  • platinum complexes are used as the addition type catalyst, but there remains a problem that platinum is quite expensive.
  • radiation-curable compositions is a very high cure rate, which offers a higher production efficiency than the heat-curable ones.
  • the radiation-curing mechanism is divided into several types.
  • Known mechanisms include an epoxy type curing mechanism via cationic polymerization and mercapto and acrylic type curing mechanisms via radical polymerization.
  • the acrylic type curing mechanism requires an equipment for reducing oxygen concentration because cure is retarded by the presence of oxygen, while its most advantage is very good adhesion.
  • the acrylic type curing mechanism can be exploited to the application where adhesion is more crucial as on PET film, with its market expansion in the future being expectable.
  • One known method for preparing acrylic-modified organopolysiloxane is the reaction of epoxy-modified organopolysiloxane with common acrylic acid to introduce acrylic groups, as described in Patent Document 1.
  • Patent Document 1 has several problems. Epoxy-functional organopolysiloxane is subjected to ring opening by reaction with acrylic acid and acrylic anhydride, whereby acrylic-modified organopolysiloxane is obtained. Regrettably, acrylic anhydride is expensive. In addition, acrylic anhydride is difficult to handle because it is highly reactive and susceptible to hydrolysis in the presence of moisture. Further, the method suffers from a slow reaction rate because the charges of acrylic groups and epoxy groups for reaction are equivalent, and a low rate of acrylic introduction because not all acrylic acid reacts with epoxy group.
  • the inventors have found that an acrylic-modified organopolysiloxane with a high rate of acrylic introduction can be prepared using inexpensive common reactants.
  • the invention provides a method for preparing a (meth)acrylic-modified organopolysiloxane, comprising reacting (A) an epoxy-modified organopolysiloxane having the average compositional formula (1): R 1 m R 2 n SiO (4-m-n)/2 (1) wherein R 1 is a substituted or unsubstituted monovalent hydrocarbon group of 1 to 10 carbon atoms, R 2 is an epoxy-containing organic group, m and n are numbers in the range: m > 0, n > 0 and 0 ⁇ m+n ⁇ 3, with (B) (meth)acrylic acid in an amount of at least 1.0 equivalent per equivalent of epoxy group in component (A) in the presence of (C) a base in an amount of 0.01 to 0.1 equivalent per equivalent of epoxy group in component (A).
  • A an epoxy-modified organopolysiloxane having the average compositional formula (1): R 1 m R 2 n SiO (4-m-n)/2 (1) wherein
  • the resulting (meth)acrylic-modified organopolysiloxane has the average compositional formula (2): R 1 m R 6 n SiO (4-m-n ) /2 (2) wherein R 1 , m and n are as defined above, R 6 is a (meth)acryloxy-containing organic group.
  • component (A) has an epoxy equivalent of 200 to 2000 g/mol.
  • component (C) is an alkali metal or alkaline earth metal hydroxide.
  • the invention provides a method for preparing a radiation-curable silicone composition, comprising the steps of preparing a (meth)acrylic-modified organopolysiloxane by the above method, and mixing it with a photopolymerization initiator.
  • the invention provides a method for preparing a silicone release liner, comprising the steps of preparing a radiation-curable silicone composition by the above method, coating the composition onto a substrate to form a coating thereon, exposing the coating to radiation for curing the coating.
  • a (meth)acrylic-modified organopolysiloxane a radiation-curable silicone composition
  • a silicone release liner a silicone release liner
  • the present methods of preparing (meth)acrylic-modified organopolysiloxanes enable substantial savings of reactant expense, because they can be done using only inexpensive reactants.
  • We find that the (meth)acrylic-modified organopolysiloxanes obtained have a notably high rate of acrylic introduction, are novel products, and may be cured on exposure to suitable radiation.
  • the cured products exhibit high substrate adhesion and are useful as release liners.
  • (meth)acrylic refers to both acrylic and methacrylic, the term being employed for the sake of simplicity.
  • EB stands for electron beam and UV for ultraviolet radiation.
  • a (meth)acrylic-modified organopolysiloxane of formula (2) is prepared by reacting (A) an epoxy-modified organopolysiloxane of formula (1) with (B) (meth)acrylic acid in the presence of (C) a base.
  • One of the starting reactants is (A) an epoxy-modified organopolysiloxane having the average compositional formula (1).
  • R 1 m R 2 n SiO (4-m-n)/2 (1)
  • R 1 is a substituted or unsubstituted monovalent hydrocarbon group of 1 to 10 carbon atoms
  • R 2 is an epoxy-containing organic group
  • m and n are numbers in the range: m > 0, n > 0 and 0 ⁇ m+n ⁇ 3.
  • R 1 is selected from unsubstituted or substituted (exclusive of epoxy-containing substituents) monovalent hydrocarbon groups of 1 to 10 carbon atoms, preferably 1 to 8 carbon atoms, for example, alkyl groups such as methyl, ethyl, propyl and butyl, cycloalkyl groups such as cyclohexyl, aryl groups such as phenyl and tolyl, substituted forms of the foregoing in which some or all carbon-bonded hydrogen atoms are substituted by hydroxyl, cyano, halogen or the like, such as hydroxypropyl, cyanoethyl, 1-chloropropyl, and 3,3,3-trifluoropropyl.
  • alkyl groups account for at least 80 mol%, more desirably 90 to 100 mol% of R 1 . Methyl is most preferred as the alkyl group.
  • R 2 is an epoxy-containing organic group, preferably shown by the following formula (i) or (ii): wherein R is an alkylene group having 2 to 6 carbon atoms which may interpose an oxygen atom, R' is an alkylene group having 1 to 4 carbon atoms, R" is hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and the broken line denotes a valence bond.
  • epoxy-containing organic group examples include the following: Notably, the broken line denotes a valence bond.
  • the preferred epoxy-containing organic group is the group of the above formula (i).
  • m and n are numbers in the range: m > 0, n > 0 and 0 ⁇ m+n ⁇ 3.
  • component (A) has an epoxy equivalent of 200 to 2,000 g/mol, more preferably 300 to 600 g/mol.
  • the amount of (meth)acrylic group in the (meth)acrylic-modified organopolysiloxane resulting from reaction of components (A) to (C) depends on the epoxy equivalent of component (A) and has an impact on the cure of the (meth)acrylic-modified organopolysiloxane and the adhesion and release force of the cured organopolysiloxane during service as release liner. If the epoxy equivalent is less than 200 g/mol, the release force may be extremely increased. If the epoxy equivalent exceeds 2,000 g/mol, the cure and adhesion may be poor.
  • component (A) has a viscosity of up to 1,000 mPa-s, more preferably up to 500 mPa-s as measured at 25°C by a Brookfield rotational viscometer although the viscosity is not particularly limited.
  • the lower limit of viscosity is typically at least 10 mPa-s.
  • the product (meth)acrylic-modified organopolysiloxane has a higher viscosity than the starting epoxy-modified organopolysiloxane, we find that silicone compositions comprising the product organopolysiloxane (prior to cure) are still in general readily coated when the viscosity of the starting organopolysiloxane was in the above range.
  • Component (A) may be obtained by reacting a methylhydrogenpolysiloxane having a Si-H group with an epoxy/alkenyl-containing compound in the presence of a metal complex catalyst.
  • the epoxy/alkenyl-containing compound is a compound having at least one epoxy group and at least one alkenyl group per molecule.
  • Suitable alkenyl groups include those of 2 to 8 carbon atoms such as vinyl, allyl, propenyl and butenyl.
  • Exemplary epoxy/alkenyl-containing compounds include 4-vinylcyclohexene oxide, 4-isopropenyl-1-methylcyclohexene oxide, allyl glycidyl ether, 1,5-hexadiene monoxide, and glycidyl (meth)acrylic.
  • organopolysiloxane as component (A) is given below. Notably, Me stands for methyl.
  • a is such a number that this organopolysiloxane may have a viscosity within the above-defined range.
  • a second reactant is (B) (meth)acrylic acid having the following formula: wherein R 3 is hydrogen or methyl.
  • (Meth)acrylic acid is used in an amount of at least 1.0 equivalent, preferably at least 1.5 equivalents per equivalent of epoxy group in component (A).
  • the amount of (meth)acrylic group in the product organopolysiloxane largely dominates the cure upon radiation exposure and the adhesion thereof. The more (meth)acrylic groups, the better the cure and adhesion become.
  • component (B) is less than 1.0 equivalent, theoretically not all epoxy groups are reacted and less (meth)acrylic groups are introduced, and as a result, the cure and adhesion may become worsened.
  • component (B) is too much, there is a possibility of side reaction to form a homopolymer of component (B).
  • component (B) is preferably up to 3.0 equivalents, more preferably up to 2.5 equivalents.
  • a third reactant is (C) a base which is used in an amount of 0.01 to 0.1 equivalent, preferably 0.02 to 0.08 equivalent per equivalent of epoxy group in component (A).
  • the preferred base is an alkali metal or alkaline earth metal hydroxide.
  • reaction mechanism can be regarded as describing the opening of the epoxy ring with (meth)acrylic acid to introduce (meth)acrylic group.
  • R 3 is hydrogen or methyl.
  • R 4 and R 5 are selected from unsubstituted or substituted monovalent hydrocarbon groups of 1 to 10 carbon atoms, for example, alkyl groups such as methyl, ethyl, propyl and butyl, cycloalkyl groups such as cyclohexyl, aryl groups such as phenyl and tolyl, substituted forms of the foregoing in which some or all carbon-bonded hydrogen atoms are substituted by hydroxyl, cyano, halogen or the like, such as hydroxypropyl, cyanoethyl, 1-chloropropyl, and 3,3,3-trifluoropropyl.
  • R 4 and R 5 may be the same or different.
  • deprotonation of (meth)acrylic acid results in an anion species, which attacks epoxy ring to open it.
  • the epoxy ring receives proton from a stoichiometric amount of (meth)acrylic acid to form a ring-opened product.
  • deprotonation occurs again to regenerate the anion species.
  • a base is considered to undergo quick reaction with acrylic acid.
  • the preferred bases are hydroxides of alkali metals and alkaline earth metals, with NaOH and KOH being most preferred.
  • component (C) may be used in a catalytic amount. However, if the amount of component (C) is less than 0.01 equivalent per equivalent of epoxy group in component (A), then the reactions may run slowly. If the amount of component (C) is more than 0.1 equivalent per equivalent of epoxy group in component (A), then a salt may form as byproduct and the treatment thereof may take a certain time.
  • a solvent may be added if desired.
  • Protonic polar solvents such as alcohols are undesirable, because deprotonation of the alcohol occurs along with deprotonation of (meth)acrylic acid, which indicates that ring-opening of epoxy can be triggered by an anion other than the (meth)acrylic acid anion, and the amount of (meth)acrylic group introduced is thus reduced.
  • the solvent which can be used herein include toluene, xylene, N,N-dimethylformamide, and acetonitrile.
  • a polymerization inhibitor may be added.
  • Suitable polymerization inhibitors include alkylphenols, for example, p-methoxyphenol, 2,6-di-t-butylhydroxytoluene, 4,4'-dioxydiphenol, 1,1'-bis(4-hydroxyphenyl)cyclohexane, 3-methyl-4-isopropylphenol, 2,4,5-trihydroxybutyrophenone, 2,6-di-t-butylphenol, 2,5-di-t-amylhydroquinone, 2,5-di-t-butylhydroquinone, 4-hydroxymethyl-2,6-di-t-butylphenol, 2,6-di-t-butyl- ⁇ -dimethylamino-p-cresol, 4,4-bis(2,6-dibutylphenol), 2,2'-methylene-bis(4-ethyl-6-t-butylphenol), 2,2'-methylene(2,6-di-t-buty
  • Amines are also useful as the polymerization inhibitor.
  • exemplary amines include alkylated diphenylamines, N,N'-diphenyl-p-phenylenediamine, phenothiazine, 4-hydroxy-2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 1,4-dihydroxy-2,2,6,6-tetramethylpiperidine, and 1-hydroxy-4-benzoyloxy-2,2,6,6-tetramethylpiperidine.
  • a (meth)acrylic-modified organopolysiloxane may be obtained by combining (A) an epoxy-modified organopolysiloxane, (B) (meth)acrylic acid, and (C) a basic catalyst, optionally adding a solvent thereto, and heating at 70 to 110°C, especially 80 to 100°C for 8 to 40 hours, especially 12 to 30 hours for effecting reaction.
  • the (meth)acrylic-modified organopolysiloxane preferably has a viscosity of 50 to 5,000 mPa-s, more preferably 100 to 500 mPa-s as measured at 25°C by a Brookfield rotational viscometer.
  • the rate of acrylic introduction is typically at least 90%, preferably at least 95%. It will be described later how to compute the rate of acrylic introduction.
  • the (meth)acrylic-modified organopolysiloxane obtained from the method of the invention has the average compositional formula (2).
  • R 1 , m and n are as defined above.
  • R 6 is an organic group containing a (meth)acryloxy group, preferably represented by the following formula (3)-1, (3)-2 or (4).
  • R and R 3 are as defined above, and the broken line denotes a valence bond.
  • the ⁇ -path refers to an attack from less substitution side of epoxy, and the ⁇ -path refers to an attack from more substitution side of epoxy.
  • a hydroxyl group is simultaneously formed as seen from formula (3)-1 or (3)-2, a product having two acrylic groups introduced as shown by formula (4) is acceptable which results from esterification with an excess of (meth)acrylic acid.
  • a mixture of products as shown by formulae (3)-1, (3)-2 and (4) is also acceptable.
  • R and R 3 are as defined above, and the broken line denotes a valence bond.
  • the (meth)acrylic-modified organopolysiloxane obtained from the method of the invention may be used alone or in combination with an organopolysiloxane of the same type having a different degree of polymerization or (meth)acrylic content, to formulate a radiation-curable silicone composition.
  • Various additives may be added to the composition as long as the advantages of the composition are not compromised.
  • Suitable additives include photopolymerization initiators such as acetophenone, benzophenone, 4-chlorobenzophenone, 4,4-dimethoxybenzophenone, 4-methylacetophenone, benzoin methyl ether, benzoin trialkylsilyl ethers, and 2-hydroxy-2-methyl-1-phenylpropan-1-one; oxygen cure inhibition suppressors such as diethylamine, 2-diethylamine ethanol and piperidine; reactive diluents such as hexadiol acrylic and trimethylolpropane triacrylic; organic solvents, leveling agents, fillers, antistatic agents, defoamers, pigments, and other organopolysiloxanes.
  • photopolymerization initiators such as acetophenone, benzophenone, 4-chlorobenzophenone, 4,4-dimethoxybenzophenone, 4-methylacetophenone, benzoin methyl ether, benzoin trialkylsilyl ethers
  • the radiation-curable silicone composition comprising a (meth)acrylic-modified organopolysiloxane is suited for use as back coating agents for pressure-sensitive adhesive tapes, protective coating agents on metal and plastic parts, and coating bases.
  • the composition is applied onto substrates such as paper sheets, plastic films, and metal foils (e.g., aluminum), by means of a bar coater, gravure coater, or reverse coater or by spraying, and then exposed to radiation for curing to form a film having a thickness of preferably 0.05 to 200 ⁇ m, more preferably 0.1 to 150 ⁇ m.
  • Examples of the radiation used for curing include electron beam (EB), ⁇ -ray, ⁇ -ray, x-ray, and ultraviolet (UV) from mercury arc lamps, low, medium and high-pressure mercury lamps.
  • the dose of radiation necessary for curing the coating may be about 2 to 5 Mrad when EB is used.
  • the coating may be exposed to radiation from a 2-kW high-pressure mercury lamp (80 W/cm) at a distance of 8 cm for 0.01 to 10 seconds.
  • the photopolymerization initiator should preferably be added to the silicone composition.
  • Rate of acrylic introduction the average of the peak integrated values of three acrylic protons / 0.50 ⁇ 100 %
  • a radiation-curable silicone composition was prepared and roll coated onto a corona-treated polyethylene-laminated paper sheet or PET film in a coating weight of about 0.8 g/cm 2
  • the coating was cured upon exposure to UV from two 80 W/cm high-pressure mercury lamps in a dose of 100 mJ/cm 2 .
  • the adhesion of the cured coating to the substrate was examined by rubbing the surface of the cured coating with the finger and visually inspecting the adhesion thereof. The sample was rated good ( ⁇ ) when the coating was kept intact, mediocre ( ⁇ ) when some coating was peeled off, and poor ( ⁇ ) when the coating was peeled off the substrate.
  • an acrylic-based adhesive tape (TESA7475 tape, 25 mm wide) was applied.
  • a sample for release force test was obtained by once moving a roller of 2 kg back and forth for pressure bonding. The sample was aged at 70°C for 20-24 hours under a load of 70 gf/cm 2 . Thereafter, using a tensile tester, the tape was pulled back at an angle of 180° and a peel speed of 0.3 m/min. A force (N/25 mm) required to release the tape was measured.
  • a 500-mL separable flask equipped with a stirrer, thermometer, dropping funnel and reflux condenser was charged with 143.16 parts of an epoxy-modified organopolysiloxane of formula (5) (epoxy equivalent 490 g/mol, viscosity 19 mPa-s), 0.3 part of NaOH, 9.78 parts of dibutylhydroxytoluene, and 0.0018 part of Antage Dp (Kawaguchi Chemical Industry Co., Ltd., N,N'-diphenyl-p-phenylenediamine), and heated at 50°C in an oil bath. Once the temperature of 50°C was reached, 43.24 parts of acrylic acid was added dropwise from the dropping funnel.
  • an epoxy-modified organopolysiloxane of formula (5) epoxy-modified organopolysiloxane of formula (5) (epoxy equivalent 490 g/mol, viscosity 19 mPa-s)
  • 0.3 part of NaOH 9.78 parts
  • the product was identified to be an acrylic-modified organopolysiloxane having the average compositional formula (6) wherein Me stands for methyl and Ac is a mixture of groups of formulae (7) to (9).
  • This organopolysiloxane had a viscosity of 141 mPa-s, a refractive index of 1.439, and a rate of acrylic introduction as shown in Table 1.
  • the broken line denotes a valence bond.
  • An acrylic-modified organopolysiloxane was synthesized by the same procedure as in Example 1 except that the amount of acrylic acid added dropwise from the funnel was 32.43 parts. After the addition of acrylic acid, the mixture was heated and stirred at 90-100°C for 30 hours. The reaction mixture was concentrated by heating under reduced pressure at 120°C for 3 hours, and filtered, obtaining an acrylic-modified organopolysiloxane as pale yellow transparent oil.
  • This organopolysiloxane had a viscosity of 138 mPa-s, a refractive index of 1.438, and a rate of acrylic introduction as shown in Table 1.
  • An acrylic-modified organopolysiloxane was synthesized by the same procedure as in Example 1 except that 49.12 parts of toluene was added. After the addition of acrylic acid, the mixture was heated and stirred at 90-100°C for 36 hours. The reaction mixture was concentrated by heating under reduced pressure at 120°C for 3 hours, and filtered, obtaining an acrylic-modified organopolysiloxane as pale yellow transparent oil.
  • This organopolysiloxane had a viscosity of 140 mPa-s, a refractive index of 1.438, and a rate of acrylic introduction as shown in Table 1.
  • Example 2 To 100 parts of the acrylic-modified organopolysiloxane obtained in Example 1 was added 5 parts of 2-hydroxy-2-methyl-1-phenylpropan-1-one as a photopolymerization initiator. They were thoroughly mixed and roll coated onto a corona-treated polyethylene-laminated paper sheet or PET film in a coating weight of about 0.8 g/cm 2 . The coating was cured upon exposure to UV from two 80 W/cm high-pressure mercury lamps in a dose of 100 mJ/cm 2 . The cured coating was tested for substrate adhesion and release force, with the results reported in Tables 2 and 3.
  • a cured coating was prepared as in Example 4 aside from using the acrylic-modified organopolysiloxane obtained in Example 2.
  • the substrate adhesion and release force of this cured coating are reported in Tables 2 and 3.
  • a cured coating was prepared as in Example 4 aside from using the acrylic-modified organopolysiloxane obtained in Example 3.
  • the substrate adhesion and release force of this cured coating are reported in Tables 2 and 3.
  • An acrylic-modified organopolysiloxane was synthesized according to the teaching of Patent Document 1 ( JP-B H05-083570 ).
  • a 500-mL separable flask equipped with a stirrer, thermometer, dropping funnel and reflux condenser was charged with 143.16 parts of an epoxy-modified organopolysiloxane of formula (5) (epoxy equivalent 490 g/mol), 75.05 parts of toluene, 0.060 part of dibutylhydroxytoluene, 1.195 parts of 1,4-diazabicyclo(2,2,2)octane, and 0.0024 part of Antage Dp (Kawaguchi Chemical Industry Co., Ltd., N,N'-diphenyl-p-phenylenediamine), and heated at 50°C in an oil bath.
  • Antage Dp Korean Chemical Industry Co., Ltd., N,N'-diphenyl-p-phenylenediamine
  • the acrylic-modified organopolysiloxanes of Examples 1 to 3 have acrylic introduced in an amount equal to or more than the amount of epoxy in the starting reactant. This is probably because esterification with a hydroxyl group (-OH) formed after ring opening takes place to form a diacrylic product of formula (9) as well.
  • the rate of acrylic introduction is no more than 87%, implying that it is difficult for all acrylic acid charged to participate in reaction.
  • the acrylic-modified organopolysiloxane of Comparative Example 1 has a higher viscosity than those of Examples 1 to 3, probably because ring-opening polymerization of epoxy takes place rather than reaction of epoxy with acrylic, forming a polymeric product.

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EP12183505.2A 2011-09-29 2012-09-07 Organopolysiloxane (méth)acrylique modifié, composition de silicone durcissable par rayonnement, doublure de libération de silicone et procédés de fabrication Ceased EP2574638B1 (fr)

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US (1) US20130085203A1 (fr)
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JP (1) JP5900253B2 (fr)
CN (1) CN103030810A (fr)
TW (1) TWI551627B (fr)

Cited By (1)

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WO2017005993A1 (fr) * 2015-07-06 2017-01-12 Bluestar Silicones France Sas Procede de preparation d'organopolysiloxanes avec des fonctions (meth)acrylates

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CN109790416A (zh) * 2016-04-29 2019-05-21 埃肯有机硅法国简易股份公司 具有(甲基)丙烯酸酯官能团的有机聚硅氧烷的制备方法
CN108203511B (zh) * 2016-12-16 2021-07-09 上海飞凯光电材料股份有限公司 直链有机硅丙烯酸酯及其制备方法、应用
JP7008432B2 (ja) * 2017-03-31 2022-01-25 信越化学工業株式会社 シリコーンが固着された繊維及びその製造方法
WO2018180615A1 (fr) 2017-03-31 2018-10-04 信越化学工業株式会社 Agent de traitement de fibres pour fixation par faisceau électronique
CN110494498A (zh) * 2017-04-13 2019-11-22 信越化学工业株式会社 剥离性放射线固化性有机硅组合物和剥离片
US11655341B2 (en) * 2017-10-24 2023-05-23 Shin-Etsu Chemical Co., Ltd. Method for preparing a radical-polymerizable organopolysiloxane, a radiation-curable organopolysiloxane composition, and a release sheet
CN111218004B (zh) * 2018-11-26 2021-06-18 比亚迪股份有限公司 聚氧硅烷及其制备方法、玻璃保护组合物及其应用
CN110183664B (zh) * 2019-04-30 2021-09-28 常州大学 一种紫外光固化型含甲基丙烯酸酯硅油的制备方法与应用
CN110156996B (zh) * 2019-05-21 2021-10-01 郝建强 单封端反应性有机硅及其制备方法
CN110628029A (zh) * 2019-09-23 2019-12-31 中科广化（重庆）新材料研究院有限公司 一种环氧基有机硅离型剂及其制备方法与应用
CN113528011A (zh) * 2021-06-25 2021-10-22 国科广化韶关新材料研究院 一种紫外光固化有机硅离型剂及其制备方法和应用
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CN118126331A (zh) * 2024-04-30 2024-06-04 杭州崇耀科技发展有限公司 一种uv离型剂的单体及其制备方法

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US20130085203A1 (en) 2013-04-04
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